Mix parsley, orange peel, rosemary, and 2 minced garlic cloves in small bowl.,Preheat oven to 450F.,Spread potatoes in 13x9x2-inch metal baking pan.,______,Sprinkle with salt and pepper.,Roast potatoes until almost tender and golden brown, stirring occasionally, about 25 minutes.,Place halibut fillets atop potatoes.,Sprinkle fish with salt and pepper.,Roast until fish are opaque in center and potatoes are tender, about 15 minutes.,Divide potatoes and fish among 4 plates.,Combine orange juice, vinegar, 2 tablespoons parsley mixture and remaining minced garlic clove in same baking pan.,Set pan over 2 burners and boil until liquid is reduced to 1/3 cup, scraping up any browned bits, about 2 minutes.,Season sauce with salt and pepper.,Pour sauce over fish on each plate; sprinkle with remaining parsley mixture.